Moreover, we know of examples where natural selection has caused drastic decreases in organismal complexity – for example, canine venereal sarcoma, which today is an infectious cancer, but was once a dog.
Or human selection. Henrietta Lax (or her cancer) is now many tonnes of cultured cells; she has become an organism that reproduces by mitosis and thrives in the niche environment of medical research labs.
Or human selection. Henrietta Lax (or her cancer) is now many tonnes of cultured cells; she has become an organism that reproduces by mitosis and thrives in the niche environment of medical research labs.